Book description
This book will appeal to scientists and engineers who are concerned
with the design of microwave wideband devices and systems. For advanced
(ultra)-wideband wireless systems, the necessity and design methodology
of wideband filters will be discussed with reference to the inherent
limitation in fractional bandwidth of classical bandpass filters.
Besides the detailed working principles, a large number of design
examples are demonstrated, which can be easily followed and modified by
the readers to achieve their own desired specifications. Therefore, this
book is of interest not only to students and researchers from academia,
but also to design engineers in industry. With the help of complete
design procedures and tabulated design parameters, even those with
little filter design experience, will find this book to be a useful
design guideline and reference, which can free them from tedious
computer-aided full-wave electromagnetic simulations. Among different
design proposals, wideband bandpass filters based on the multi-mode
resonator have demonstrated many unparalleled attractive features,
including a simple design methodology, compact size, low loss and good
linearity in the wide passband, enhanced out-of-band rejection, and easy
integration with other circuits/antennas. A conventional bandpass filter
works under single dominant resonant modes of a few cascaded
transmission line resonators and its operating bandwidth is widened via
enhanced coupling between the adjacent resonators. However, this
traditional approach needs an extremely high coupling degree of
coupled-lines while producing a narrow upper stopband between the
dominant and harmonic bands. As a sequence, the desired dominant
passband is restricted to an extent less than 60% in fractional
bandwidth. To circumvent these issues and break with the tradition, a
filter based on the multiple resonant modes was initially introduced in
2000 by the first author of this book. Based on this novel concept, a
new class of wideband filters with fractional bandwidths larger than 60%
has been successfully developed so far. This book, presents and
characterizes a variety of multi-mode resonators with stepped-impedance
or loaded-stub configurations using the matured transmission line theory
for development of advanced microwave wideband filters.
LEI ZHU, PhD
, is Associate Professor at the School of Electrical and Electronic
Engineering, Nanyang Technological University, Singapore. Dr. Zhu was
the first to introduce an MMR-based filter in 2000, which has since
spurred the successful development of a new class of wideband filters
with fractional bandwidths larger than 60 percent.
SHENG SUN, PhD, is Research Assistant Professor in the
Department of Electrical and Electronic Engineering at The University
of Hong Kong.
RUI LI, PhD, is a Research Fellow in the Interconnection and
Advanced Packaging Program at Singapore's Institute of
Microelectronics. She was the recipient of both the NTU Research and
the Ministry of Education Scholarships in Singapore.
